In preliminary research, proanthocyanidin was reported to have anti-mutagenic activity. Studies also show that proanthocyanidin antioxidant capabilities are 20 times more powerful than vitamin C and 50 times more potent than vitamin E2. They also work directly to help strengthen all the blood vessels and improve the delivery of oxygen to the cells. Having affinity for cell membranes, they provide nutritional support to reduce capillary permeability and fragility. These they owe to their role in stabilization of collagen and maintenance of elastin.